Demography and the future

I have posted a lot about demographic trends in the world, mainly Europe and the US. So this caught my eye.

I have been reading Canadian journalist David Warren's work for a long time. His essay points out that the much higher birthrate among Muslims than Christian isn't "much" higher after all, and that.

... the Muslim acceleration dates only from about 1950. It is historically anomalous, and can be explained by several obvious external factors. All trends are reversible, as I like to say. 

My bet is they can’t keep it up.

Which may be true, but the real question is who will enter the demographic death spiral first, the rate that is so low that population recovery becomes so unlikely as to be effectively impossible. It is already a reality in a few Euro nations.